New Delhi, Nov. 6 -- Delhi and NCR remained toxic for its residents on Monday as a thick blanket of smog covered the national capital, with Delhi AQI slipping to the 'very poor' category on Thursday evening.

While Delhi Air Quality Index (AQI) had improved slightly over the past two days and was recorded at 278 on Thursday morning, the pollution levels dipped to the 'very poor' category by the evening thus taking Delhi to the red zone again.

The 24-hour average Air Quality Index (AQI), reported at 4 pm every day, stood at 311, as per the Central Pollution Control Board (CPCB).

As per the CPCB's Sameer App, 32 out of the 38 AQI monitoring stations in Delhi showed readings above 300, falling under the 'very poor' category.

In the mornin...